Definition of trigger hair in English:

Share this entry

trigger hair

noun

1 Zoology (In a coelenterate) a filament at the mouth of a nematocyst which triggers the emission of the stinging hair when touched.
Example sentences
  • At the narrow outer edge of the cnidocyte is a short trigger hair.
  • When the trigger hair on the outside of a nematocyte is touched, a coiled thread tube inside the enclosed nematocyst is released.
2 Botany A bristle on the leaf of a Venus flytrap which triggers the closure of the leaf around an insect.
Example sentences
  • The first phase of the leaf closure begins when a trigger hair is disturbed.
  • The flytrap features a set of inch-long, heart-shaped capture leaves, each fringed with trigger hairs and bisected by a deep fold.
  • Darwin's investigation into the biology of the Venus flytrap involved testing the sensitivity of trigger hairs.
Share this entry
 

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.